When the game's performance is very poor - say, less than four frames per second - the new overlay for the spyglass will flash back and forth between the first frame of the animation and a black screen, with the former increasing in size each time it appears. The overlay gets so large that the seemingly smooth edge of the light reflection effect becomes a jagged sawtooth pattern. But the most important part is that the flashing could cause seizures, even if the game needs to run poorly while using the spyglass to do so. If this issue gets looked over due to its requirement of very specific circumstances I would understand fully, but I at least wish to mention it for anyone who it may concern.